How to switch between RS485\RS422 for K4-4th Gen models?

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K4-4th Gen 机型如何切换RS485\RS422?

  • 适用机型:K4-i5-4200U/i7-4500U

PS:该机型共有两款主板板型,板型1为PE_H81U-V1.11(1G网卡机型),该板型只需改主板跳帽即可切换,不需要修改BIOS。板型2为PE_H81U-V1.61(2.5G网卡机型),该板型需要进入BIOS改COM口工作模式+改主板跳帽。

  • 1、按开关按钮后快速敲击键盘Delete键进入BIOS,依次选择Advanced>IT8786 Super IO Configuration>Serial Port 2 Configuration>将COM2 Mode设置为R485,设置完成后按F10保存并退出。
  • 2、断电状态下拆机,找到主板 上JCOM2_SET1排针,该排针用于切换RS232\422\485模式。当您需要将其更改为RS422时,将跳帽移至引脚3-4;当您需要使用RS485时,将跳帽移至PIN 5-6。
    PS:该跳帽默认插在pin1和pin2引脚上,移动该跳帽后外置的COM2将失效!
  • 3、根据需求从机箱外接RS422或RS485排线到主板JRS485-422排针,排针脚距2.54MM。RS422需要连4根线,RS485需要连2根线。下图为JRS485-422引脚定义:
3-1
  • RS 485模式排线连接示意:
  • RS422排线连接示意:
    PS:因RS422需要4根排线,尽可能使用不同颜色的电缆,这样更方便区分排线信号类型!

作者: minipc

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